<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!-- CSS -->
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.6.2/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
    <!-- jQuery and JavaScript Bundle with Popper -->
    <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.slim.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
    <script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.6.2/js/bootstrap.bundle.min.js" integrity="sha384-7ymO4nGrkm372HoSbq1OY2DP4pEZnMiA+E0F3zPr+JQQtQ82gQ1HPY3QIVtztVua" crossorigin="anonymous"></script>
</head>
<body>
<!--<ul class="nav">
    <li class="nav-item">
        <a class="nav-link active" href="https://www.xiaomi.com">小米官网</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="https://www.huawei.com">华为官网</a>
    </li>
    <li class="nav-item">
        <a class="nav-link" href="https://www.apple.com">苹果官网</a>
    </li>
    <li class="nav-item">
        <a class="nav-link disabled">禁止点击</a>
    </li>
</ul>-->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mr-auto">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-expanded="false">
                    Dropdown
                </a>
                <div class="dropdown-menu">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <div class="dropdown-divider"></div>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
            <li class="nav-item">
                <a class="nav-link disabled">Disabled</a>
            </li>
        </ul>
        <form class="form-inline my-2 my-lg-0">
            <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
    </div>
</nav>

<div id="list-example" class="list-group">
    <a class="list-group-item list-group-item-action" href="#list-item-1">Item 1</a>
    <a class="list-group-item list-group-item-action" href="#list-item-2">Item 2</a>
    <a class="list-group-item list-group-item-action" href="#list-item-3">Item 3</a>
    <a class="list-group-item list-group-item-action" href="#list-item-4">Item 4</a>
</div>
<div data-spy="scroll" data-target="#list-example" data-offset="0" class="scrollspy-example">
    <h4 id="list-item-1">Item 1</h4>
    <p>...</p>
    <h4 id="list-item-2">Item 2</h4>
    <p>...</p>
    <h4 id="list-item-3">Item 3</h4>
    <p>...</p>
    <h4 id="list-item-4">Item 4</h4>
    <p>...</p>
</div>

<div class="spinner-border text-primary" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-secondary" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-success" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-danger" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-warning" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-info" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-light" role="status">
    <span class="sr-only">Loading...</span>
</div>
<div class="spinner-border text-dark" role="status">
    <span class="sr-only">Loading...</span>
</div>
</body>
</html>